| Nominalna średnica śrub calowych | Średnica śruby w mm | Ilość zwoi na długości 1 cala dla gwintów calowych | |||
| Międzynarodowy | Brytyjski | ||||
| Skok gruby UNC | Skok drobny UNF | Skok gruby BSW | Skok drobny BSF | ||
| No"0 | 1,524 | - | 80 | - | - |
| No"1 | 1,854 | 64 | 72 | - | - |
| No"2 | 2,184 | 56 | 64 | - | - |
| No"3 | 2,515 | 48 | 56 | - | - |
| No"4 | 2,845 | 40 | 48 | - | - |
| No"5 | 3,175 | 40 | 44 | - | - |
| 1/8" | 3,175 | - | - | 40 | - |
| No"6 | 3,505 | 32 | 40 | - | - |
| 5/32" | 3,969 | - | - | 32 | - |
| No"8 | 4,166 | 32 | 36 | - | - |
| 3/16" | 4,763 | - | - | 24 | 32 |
| No"10 | 4,826 | 24 | 32 | - | - |
| No"12 | 5,486 | 24 | 28 | - | - |
| 7/32" | 5,556 | - | - | 24 | 28 |
| 1/4" | 6,350 | 20 | 28 | 20 | 26 |
| 5/16" | 7,938 | 18 | 24 | 18 | 22 |
| 3/8" | 9,525 | 16 | 24 | 16 | 20 |
| 7/16" | 11,113 | 14 | 20 | 14 | 18 |
| 1/2" | 12,700 | 13 | 20 | 12 | 16 |
| 9/16" | 14,288 | 12 | 18 | 12 | 16 |
| 5/8" | 15,875 | 11 | 18 | 11 | 14 |
| 3/4" | 19,050 | 10 | 16 | 10 | 12 |
| 7/8" | 22,225 | 9 | 14 | 9 | 11 |
| 1" | 25,401 | 8 | 12 | 8 | 10 |
| 1 1/8" | 28,575 | 7 | 12 | 7 | 9 |
| 1 1/4" | 31,750 | 7 | 12 | 7 | 9 |
| 1 3/8" | 34,925 | 6 | 12 | 6 | 8 |
| 1 1/2" | 38,100 | 6 | 12 | 6 | 8 |
| 1 3/4" | 44,450 | 5 | 12 | 5 | 7 |
| 2" | 50,802 | 4 1/2 | 12 | 4 1/2 | 7 |